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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1211b86b25caba9293011ab27985f64c5243a827b9c436b978c05912a967904d' 
  AND token = '8Xa0Y3wGJjtiN0un1yRPeg1D1Rid6JecL1PIjpqxGC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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