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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea572d9c790f5b3077bda16e44cb8be31629f6e8d99f4d39f14bd9fdf7df85bb' 
  AND token = '84a3Enzu6046NtwZ3kDyfZHeQS4hLZWeLXenzHP+x/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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