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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e577552eaa77ca6d9c1014826c4a459eeda0f9304cb0152f9e8a6bfd610fc673' 
  AND token = '9gwzcruap5K6TDnLUk7eo5Q3VAqLeChMzKwcYeJZ20o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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