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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d89cf2e1221ff2cb980c6c918f4a0618dab097afbccebcb319e100f8040375' 
  AND token = '2V3FLADAFq9miolDkDUHGFG5C2El6EyRitNxzdE3eRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}