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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e13b365e153b5d1dd66b526da9c40523b03b0f3ed974c5c789b31947ef53be' 
  AND token = 'wFKojtdmAuZmTtIVVlWQZ8DzLF/qlSzddbtH02F9eD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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