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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a1e831340d2b6fe81d162af3efeb9431e768e69ec2b7a70d013e5b9ea5467c' 
  AND token = 'DguIXoL42lFCHNiDB+VuhR5KbqRvoerENmTXQNcc/QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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