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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac93d9c5aa348dfc76a748344eb447a2f6ba800e8d135379d69f3aa5166ff8a5' 
  AND token = 'UBB3NT86GRsV9y5EmM9S1ZSP0NVNXKAFesDeoGV7Mbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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