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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985af08650665e8aa1c660f4d9dbcf5b6c0d88adbd49b3b2dcc1a4ff19fa019f' 
  AND token = 'Rv+/wLySN2ivVQy+i6XB5sIdhyqoYhhnhMtSTj03xGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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