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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118c853506fa3f73a8c73cafc0d42d1e0d13a921d7f71cfe4f441e45b16cdea7' 
  AND token = '0F7VB+sxNO+DJRbT75Fy+ufZWM1YeImJeqW6GlN3AIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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