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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870e642db11b570144b08dbf7768fb62903c2303ad28cf572eda19fe8eb5995a' 
  AND token = 'wTfNmh9qSKT3wEsL/tMGjWAvDzOk64AhbIcMG7hdTWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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