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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a038ceaef299b21efb52affd8b9e966b1c1af6dfa2e43c5470cae4863e17d5' 
  AND token = 'xlOd1lWArD1t4eZIO8UsYL8Cun5zLeGIKvmVEmyVrHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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