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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0ad0621f812223b00715680e6569c29b72ace5aa12a46f5c6a2ab8a8abed8b' 
  AND token = '/vMOOpSa9MlTlvFYews/ncSQdcgzakfA8sDtDPZunDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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