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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee085029a4040af7b51885cbe5308f04654ab834c82ec346046d9c5369d33e6' 
  AND token = 'bPXwoOvOWId1S7jgATp+Tbe4A5U7iu8RHpSWwXLeswk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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