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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a136a4ebc0f07e7212de33a16c263ed7ae03a1976c7c05ef92ff858517e8d9f' 
  AND token = 'SfTSwmw6zPhLG+G8f9GGjqZM6cbgDwgdm3ilhh5wid0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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