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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfcee798159fd9baf4ee996495243e4b4bb5105a3de7868c2c5b1ad96f1e6e6' 
  AND token = 'oFqm7waFwvtiPpZsBjJOzr7xV5kG6zeTwxwUnniPz9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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