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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6d2ed1f15fb9e1b4c3ad40ba523a52650f6b667f930d848035d6526a92f2d3' 
  AND token = '0M6x1AZsbb/OEu+L7XhX8a702+l2CIYMbmQQuFKVX9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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