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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504c2da0ed6cf95fc16625d45716ccf055d2d8c99adc95b270ef0f1423616303' 
  AND token = 'h+eWdkIFn8j5oIF3z5nwLPUng5bCPiVpAcvwup82DbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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