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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b49bba5afa33903d14ae9b5673b06973257c6d5626d48e3946a1149de888360' 
  AND token = 'IdRx54gc062gfnGaHbQdTNUa09ZtoKWAZfFs/1FTy9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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