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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616f611a2b22dbadacb92aaf9520f4f90b19ea59e2516d7e1afa548b419687e5' 
  AND token = 'mia6ercRxtLaUmW8+jYsjzEZTOjJn2l8rz4NByX6cCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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