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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e7fd877265943b9871d16d7af7ffd1b9916c193cf69744a9c6f7eb59fe77d3' 
  AND token = 'WjBYC58k7nsBrAiqIyrGNFW9OUdMDRMadQtkFT0s30A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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