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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab239850669ec7ee8a3166e4fad503f4925ecb0053852c975fec283c17eceac' 
  AND token = '1NyMQLZeCFL/CrYmmoLK2fu3DTWFjzLFFA1cgCa/PLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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