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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc44cd13f4e336391620ec467f6031b5aecc90d0211ec03a21df44087f4bc311' 
  AND token = '2G215iaIm9epM1DWXmXpIB9bfpA7dXFeB17yhzA1BPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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