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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016d67e89dca072c1abee6f46b44c9dde1f8d75cdb4c3df684ffda1f6e9628ec' 
  AND token = 'ZJQDGQg21gf1nlh4u0MgM686nnsJylpmLl48su9MMBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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