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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de97a087cc21da72d5be762167fa72f639955c4a3877f3d1e053eb16869336e2' 
  AND token = '3Jfz/nUx8cilxCucoSHOX5EHmr58g7rFlm4NZ99TPwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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