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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325b5b0c3bf2866efe6fae6a9ce98a3148f07f77ef03db687e802663af0469c6' 
  AND token = 'ptLHvEp5A9Z/vNbVobbyKF+m0LG5nD7Kyx7RiQ3lj3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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