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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd70494616a951524af2bd4febe7dd501e971bca249087f8fd13b7e390eb89c' 
  AND token = '6G8c/CUEUG4ADgaaaHPjl2g/4NXwRXiHUaFaowchOb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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