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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba68c0cff7f00c7f86f9554ef6ef2c7ea0bca1a90802e1dcc31dc3607d53884' 
  AND token = '+7H1x+Kf4djYsP8VMfobhZRFiRsjdraE6oXER7hLsUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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