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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e06d2cfba9d64782af160232145c10f10e7cccdb06faa79236a1d8cff8f20a4' 
  AND token = 'wsZugyd5wq7Un0O46s3QOdyD8VxQ6ayJrUkLixeX0LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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