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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc174c4581e34e1f4f6a5c65ed399cf339281c776b0c7f77bd7ad7965f0f41d' 
  AND token = '2S/dHCBmLmuH8ZcU7wDnymBj4t61VicUi0H5Ebx2Olc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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