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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0603408d153c2630a28e4624cc33208305384bcff03364db1239bfa00a290779' 
  AND token = '6nYOYbHb/oqdqvOzs5d/Ga9/ZsApQIEq5urO65gWwrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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