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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3779a99b78451c1887413e8d7279447dbba789cc3ca518bff6c9972d83e9b2f2' 
  AND token = 'ADd4LfpQEYh2mZ0kUWZIN/weO9Sr4D8IHznLj9/dheY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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