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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a6524c9c5e06e79a17e29ae932b337944721b90e71002fbf7514a98e05e98b' 
  AND token = 'GwP1vihmQIB+7SQ3W25uk67VL6KvWu2DXpzq4Iy0Dm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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