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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51611b82fc92b0f8a6e055ee8c14a8485370f29c80f832e260b9036ba202cf4' 
  AND token = 'gffeC8TG9tKTIH6gOqrudUA1p0QLFOvnMeDq+ouXygY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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