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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3544e92c3f131217786367f6a2bdde7c2fe4532a11095cea78ec3577e7e49e39' 
  AND token = 'GiYfrPUxkYUZEMsnyFl8KTKdrxmLQlHULNpbuQx/u2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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