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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046978768990716aa0ddc33c908be03c566e8b7f92dfe5b20967c08fa98df3e0' 
  AND token = 'JBgRR5XIGJcpk/BkZIUCcDw71oLpgFQ8INyd9M2mu78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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