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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdaeeb70a7369b4c45199f911d37c99fbde0e1eedbdcf084f1b9608c18755fc' 
  AND token = '3Q1RksF9lEwXpq8SIhAA8cCykB/2HKvNdiG06b1DWM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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