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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6958c8d65a871fbd5fd6f8bec371be96fddb9d9fe2287c3005f05bc022b238b6' 
  AND token = 'h8Qg/e350FA2+S+MYl15R5SFUt73DNhDkb03io/V2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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