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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582d226a204b3fa0671285c050bb7829e792f9a0ad8032df62ac79457ea12347' 
  AND token = 'YKFHS2vw5klsktOauJ7QkXnDiED1M5kylrPLwTeUSUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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