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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183239e6176fb290d26d233c61b57e37e4bb8d1a422f0f385f99ccd790cbffa5' 
  AND token = 'MUFDMGipT341XoHUZ8Mekbi6u/BcQ+YK3ARRzcok2sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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