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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39678c334ba91acb65bd7e0a00a3d59b535c64d731caa75f6947cf0b9f775e6' 
  AND token = 'BiFhDDDao3NZiZ39iLgsUc47WFBzjPFPuIU2/ZM39CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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