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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3006d9953e3f259622b9081221080ecbacdb0c7a240324004275373843c32427' 
  AND token = '4/RvlXXMTv0R1kznthjP95pE1NQW9H5bCJRftYnltk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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