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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b2d935fbc15d8008859584a31cf87dc52eacbc078d24c89deb376b04de67df' 
  AND token = '3FRTC37n+EMvnh0+tXcQXr+DeuGHpWukRfeUSlOO+lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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