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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a26eb6a17ea432b00f440eb4faf24e5ab42e0e6a4b8863ac053f6861a0ecbcc' 
  AND token = 'ZEb37yZf/W6ExiOoXUaSAvrdCUyVrK3VGMjfxeLespM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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