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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cf334fdc52f6c13829f3d30ed7a3c1f24e0b8768026b83348e422d7f29b797' 
  AND token = 'eaMpzOR9eIMkYW7cgzYOXR+QVMA68yVAzqUWxV4UPM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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