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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ffcd9f126fd24325237c1dc69a480926920a90e3cfb25491008987aca4aae6' 
  AND token = '1Ik+UYk20+RumVbP8EwkOGX6mn+W+Trosnwl3YXm1t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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