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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf871de4edafd77eb1c7ebee0aa2b34fe0317366502a0a19722698b65650b4d1' 
  AND token = 'bONQ59S+H1nAl+tJ+0valJ7nqdKmGC1TPNgy7cnUsv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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