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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025a96ac756c38bdd29edf5c6148fee0b61bcde536168410f7dbfad9b0b9d719' 
  AND token = 'Yms9Dej1UrtBHYwAh4J2Di+Cwz9PG3ysfXoK7K0OMcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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