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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f7248e9c2f8081e3126662e6c901b26193ce2d33957a1d214d732581146f14' 
  AND token = 'wnonPShQA4PgSEAKf1eYq7t2MKkgJFpzgM0nWOzw/Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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