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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd2d90213b17c637164d0adc7868dd684691d5ba2a386311d72d457172692ce' 
  AND token = 'sjGFJPY+1Pa3bLEa9FrYc+1ioL2O3uvdRGXh+BcHUlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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