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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2c73fd7be8e3372cb19950a5bc8bf7214c3485d18c72fce7b4ac74f596820d' 
  AND token = 'liX99onDwE7/WFwkivObyK48umtO8/IHjdUDeFjX1x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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