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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc09d2abb95ccdb8a037edaa0072b27a902629126122bf9fc52f546d5469d576' 
  AND token = 'xSCVLOxeZgkmNdQ2LoS86CHmXUiNeS73XpbOOhcT8KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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