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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a10a2300f09afab65d5c352cf48ac60778fc5aeec4a0ce8745945413f4417f9' 
  AND token = 'ZO/Nx+Ap7Mkt8nlj4uVfHriQuKFVFxME17B8pIlF8iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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