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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc59a3a64b3057c4ad13cc97c7c70c132b77e8f5190f6339350ba8aa12ce3a57' 
  AND token = '0WeQaix8ut0EB4TB02LpBpOBP2tbew5/jlx5JIfXKSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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