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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c24bbfca0184895d6a874e4c88ddb4a7dfb675f793e5b7ab921b5bea0c6ab4' 
  AND token = 'm5Nohp5zWElX7zl6415oDjFWHor46qjMFOu6ronedGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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