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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f70883808e6687056fb94a6a3db2651a28caa63932b4c3369991f55e8084e4' 
  AND token = 'xsBX5nNNUtU9vK2tvuVdG3lfSDL+WrT3VCr4sgLnQR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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