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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f005809d53b675f50d9f7d70ffbba5ef58afdc6a8f522802883ea4f6f8cf3e3' 
  AND token = '1zEmktVIU89qi92ie38VlimfYJQQvketyiXU602k/3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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