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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0e51231f6919ddad43f0c0141a42fbc06971ebcec1070ffb15b020847349fb' 
  AND token = '+g+ohdbD3IHa519BT5pGhr/11GcIOwq7vIKBicdEt6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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