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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afc654c1c4f2235b73e326d32b531bb61a1e7069fdfe481e19a448e4ac29929' 
  AND token = 'mcCATOt8Cb23q/y5Qdt/MgDzChZYvc5lirl6j+oDz94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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