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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c25b96d9cce1e20456b971eb523c9a2ba09c9cf04b2f1f9b9aa7dd19a64d3e3' 
  AND token = '1qGFZgJKWL9PxTn3LsPGUjp0GKSVHmeVHT1FVkFaA2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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