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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f096f4b8aea7dcb95064a9bf97ddf3b4794a9d189838ed18c314f5b62d2c22a7' 
  AND token = 'BXcrAMfgHFFB8/QvLoDEzkGa7Nta63DPF7GMw92FsYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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