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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269abb5137d115d16e969dc1d29684cdd71db6e4600a70657f1c6f52ab28e620' 
  AND token = 'pg2e1bNe8vC6ME1KGZ81mI30NwfwDUpWO+KcMLaI0Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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