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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d55841ecea4477bf4753947175410570b41a40f606a0f1930976d60dc437880' 
  AND token = '36Uk3LhVZvjENOIscmiTcT1EE+ZjHxRZ8d19fAzDgYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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