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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc95c04b5cabca39f7bd9abdea9d2776fb4ff4e524e75cac0794e1de4fef1e6c' 
  AND token = 'QfswOfMJgaTSlZDW2MFjPour3xKqxkxl4zWFeKna8p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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