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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e95c320f527fd4006efab9730df6651f2dbb74c261b832043d2600cf22bbe2b' 
  AND token = 'VtG7nlmVW4vd1Ix5ejzS1KxOrDlI/BgrF6NYrpr1EM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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