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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a7823a6bc3ee28046aa466db46b37c86d774c8ac16faa32c5afb32c183d508' 
  AND token = 'LDmDxpDERngMAi5xD0hAOKezLGiorgmn0SLXWKQHJNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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