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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a96b7793bdaa2a16ab3e8439b30bb9b28c3e114eb936506e60923882559d51' 
  AND token = 'z3SQ/9Y9vvcqOux3TKm0SITYUYYMU0Z8a56mpyfbPlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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