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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edb1ed3bc690957b0f872b25412167687bb6edbbe8341d8e85c841527c5a855' 
  AND token = 'M2gucTCjWZbDjO5cOtUhXzyHb4Z0RGXBY+TvsTJGhEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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